ocaml 5: restrict pratter releases
They rely on `Stream`:
#=== ERROR while compiling pratter.1.2 ========================================#
# context 2.2.0~alpha~dev | linux/x86_64 | ocaml-base-compiler.5.0.0 | file:///home/opam/opam-repository
# path ~/.opam/5.0/.opam-switch/build/pratter.1.2
# command ~/.opam/opam-init/hooks/sandbox.sh build dune build -p pratter -j 47 @install
# exit-code 1
# env-file ~/.opam/log/pratter-8-82969e.env
# output-file ~/.opam/log/pratter-8-82969e.out
### output ###
# (cd _build/default && /home/opam/.opam/5.0/bin/ocamlc.opt -w -40 -g -bin-annot -I .pratter.objs/byte -no-alias-deps -o .pratter.objs/byte/pratter.cmo -c -impl pratter.ml)
# File "pratter.ml", line 93, characters 36-44:
# 93 | let rec nud : table -> Sup.term Stream.t -> Sup.term -> Sup.term =
# ^^^^^^^^
# Error: Unbound module Stream